(Z)-3-Alkylidene-4,5-dihydro-4-hydroxy-5-methyl-2-(3H)-furanones 5 were prepared from appropriately substituted propargylic alcohols 1 by a sequence of hydromagnesation to γ-hydroxy vinylstannanes 2, subsequent photooxygenation and reduction to stannyl diols 3, iododestannylation to iodo diols 4, and finally cyclization by palladium-catalyzed carbonylation (for 5a) or Ni(CO)2(PPh3)2 (for 5b,c). The reaction sequence can be performed enantioselectively by starting with chiral propargylic alcohols. The current approach constitutes a convenient four-step synthesis of optically active lactones 5 from readily available starting materials and is applied herein to the preparation of the natural lactone dihydromahubanolide B.
(Z)-3-亚烷基-4,5-二氢-
4-羟基-5-甲基-2-(3H)-
呋喃酮 5 由适当取代的炔
丙醇 1 通过一系列
水镁化制备 γ-羟基
乙烯基锡烷 2,随后光氧化和还原为甲
锡烷基二醇 3,
碘脱
甲烷基化为
碘二醇 4,最后通过
钯催化的羰基化(对于 5a)或 Ni(CO)2(PPh3)2(对于 5b,c)进行环化。该反应顺序可以通过从手性炔
丙醇开始对映选择性地进行。目前的方法由容易获得的起始材料构成光学活性内酯5的方便的四步合成,并且在本文中应用于天然内酯二氢mahubanolide B的制备。